Manufacturing method of hydrophilic polyester short fibers for directly spinning spun-laced non-woven fabric

Abstract

The invention provides a manufacturing method of hydrophilic polyester short fibers for directly spinning a spun-laced non-woven fabric. The manufacturing method comprises the following steps: carrying out esterification on polyester slurry, carrying out pre-condensation polymerization, carrying out final condensation polymerization, spinning and carrying out after-finishing. In a pre-condensation polymerization process, comonomer polyethylene glycol PEG is added, the molecular weight of the added PEG is 1500-2000, and the adding amount is 0.5wt%-1.0wt% of a polyester melt. The temperature of the melt obtained by the final condensation polymerization is controlled to be lower than 290 DEG C, so that the quantity of generated annular tripolymers is reduced and the spun-laced processing efficiency of the fibers is improved. A hydrophilic modifier is added in an online polyester synthetic process and the polyester melt is directly used for spinning; the production cost is lower compared with the production cost of chip spinning, the quality uniformity of the short fibers is improved by 50% and the hydrophilic effect is obvious; eight paths of surface treatment are carried out, so that the distribution of a fiber surface finishing agent is uniform and the attaching firmness is improved; the fiber surface hydrophilic effect is improved in a spun-laced processing process; and the polyester PET short fibers can be used for completely replacing mucilage glue short fibers to be used as production raw materials of the non-woven fabric, so that the whole cost of the non-woven fabric is reduced.

Description

technical field [0001] The invention relates to a method for manufacturing hydrophilic polyester short fibers for direct spinning spunlace nonwoven fabrics, belonging to the technical field of synthetic fibers. Background technique [0002] Polyester fibers, especially PET staple fibers, have been used in the field of non-woven fabrics (Non-Woven) since the 1980s. They are mainly used in needle punching, chemical binders, and hot-melt bonding to form non-woven fabrics. The spunlace process is a major technological breakthrough in the non-woven industry. Many extremely fine high-pressure water needles are sprayed vertically to the fiber mesh supported on the polyester monofilament mesh or metal curtain mesh, so that the fibers are subjected to high-pressure water flow (also known as water needles). The role of entanglement and reinforcement, forming a spunlace nonwoven fabric. [0003] Compared with non-woven fabrics formed by metal needle punching or chemical or hot-melt re...

AI Technical Summary

Problems solved by technology

[0010] At this stage, the chemical hydrophilic modification technology of polyester PET is mature, but the modified masterbatch blending or intermittent chip melt spinning is mainly used, which has relatively high production costs and uneven fiber quality; the large-capacity direct spinning technology is also very mature , the daily output of staple fiber can reach 300 tons, the production efficiency is high, and the production cost is low, but the main product target is the fiber for ring spinning or air spinning, and the requirements for the exfoliation on the fiber surface are relatively low. Therefore, the actual PET melting The content of cyclic trimers in the body is relatively high, reaching more than 0.8wt%. After spinning and stretching heat setting, these cyclic trimers will migrate to the surface of the fiber and peel off under external force. Usually these peelings The content of the exfoliation reaches more than 0.3wt%. Since the melting point of these exfoliations is as high as 310 ° C and is insoluble in water, it is possible to block the spunlace injection holes, resulting in a decrease in the processing efficiency of the non-woven fabric and a decrease in the quality of the non-woven fabric; conventional polyester The surface treatment process of PET staple fibers is relatively simple, and the uniformity and adhesion fastness of the treatment agent on the fiber surface are relatively weak, resulting in a decrease in the processing efficiency of the spunlace nonwoven fabric and a decrease in the uniformity of the physical and mechanical properties of the nonwoven fabric.

Moreover, generally speaking, the sales price of viscose staple fibers for spunlace nonwovens is about 1.5 to 1.8 times that of polyester PET staple fibers for textile yarns, resulting in high cost of spunlace nonwovens.

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